class RuboCop::Server::ClientCommand::Start

def run
  if Server.running?
    warn "RuboCop server (#{Cache.pid_path.read}) is already running."
    return
  end
  Cache.acquire_lock do |locked|
    unless locked
      # Another process is already starting server,
      # so wait for it to be ready.
      Server.wait_for_running_status!(true)
      exit 0
    end
    Cache.write_version_file(RuboCop::Version::STRING)
    host = ENV.fetch('RUBOCOP_SERVER_HOST', '127.0.0.1')
    port = ENV.fetch('RUBOCOP_SERVER_PORT', 0)
    Server::Core.new.start(host, port)
  end
end